Coloration of materials



Patented Oct. 26, 1937 UNITED STATES COLORATION MATERIALS George Holland Ellis, Spondon,

land, assignor to Celanese near Derby, Eng- Corporation of America, a corporation oi Delaware No Drawing. Application May 4, 1932, Serial No. 609,271. In Great Britain May 22, 1931 8 Claims.

This invention relates to a new process of producing pattern effects on textile materials, and to theproduction of compounds or compositions suitable for use in this process.

In order to produce pattern efi'ects on textile materials the latter may be colored with a ground color and then printed with a composition con tainlng an agent which will discharge that color in the selected areas. As a modification of this 10 process the material may be printed with a composition containing the color discharging agent prior to the application of the ground color which thereupon does not color the printed areas. Both of these methods may be modified by the incorporation in the printing composition of a coloring matter which has an aflinity for the materials, I or which can be fixed on the material, and which is not affected by the discharging agent. In this manner colored pattern effects may be obtained on colored grounds.

A discharging agent commonly used in the discharge printing of cellulosic materials such as cotton is sodium formaldehyde sulphoxylate. In the discharge printing of materials, made of or containing cellulose acetate, however, sodium formaldehyde sulphoxylate has been found to be relatively ineffective.

It has now been found that excellent discharges on textile materials in general, and on materials made of or containing cellulose acetate or other cellulose esters or ethers in particular, may be obtained with the aid of aldehyde or ketone sulphoxylates of metals capable of exhibiting more than one valency or with the aid of mixtures comprising aldehyde or ketone sulphoxylates and compounds of metals capable of exhibiting more than one valency.

Examples of metals capable of exhibiting more than one valency of which the aldehyde or ketone 40 sulphoxylates may be prepared in accordance with the present invention are tin, titanium, copper and iron. In the production of discharge eifects, however, it is preferred to employ'the aldehyde or ketone sulphoxylates or other compounds of metals forming colorless or substantially colorless oxidation products, and fromv this point of. view compounds of titanium and tin are preferable to compounds of iron or copper.

The aldehyde and ketone sulphoxylates of metals capable of exhibiting more than one valency may be conveniently obtained by the interaction of aldehyde or ketone sulphoxylates, or materials capable of yielding aldehyde or ketone sulphoxylates, 65 metal. For instance sodium or other alkali metal and a compound of the formaldehyde sulphoxylates may be treated in aqueous solution with an aqueous solution of a water-soluble stannous, ferrous or titanous salt and the desired metal aldehyde sulphoxylate isolated. 5

The sulphoxylate compound may be derived from any desired aldehyde or ketone. Examples of such bodies are formaldehyde, acetaldehyde, benzaldehyde and acetone. The aldehyde and ketone sulphoxylates obtained in the manner de- 10 scribed above may be utilized for the production of discharge eifects on textile materials, if requisite after admixture with thickening agents to fit them for local application by printing or the like. It is not essential however to isolate 15 the aldehyde or ketone sulphoxylate compounds as the crude mixtures resulting from the interaction of aldehyde or ketone sulphoxylates and salts of metals capable of exhibiting more than one valency may be directly utilized for the produc- 20 tion of discharge effects. Further as previously explained aldehyde or ketone sulphoxylates may be simply mixed with compounds of metals capable of exhibiting more than one valency, if requisite together with thickening agents or other 25 additions, and the mixtures utilized for the production of discharge effects. For example a discharge composition may be employed in accordance with the present invention comprising stannous chloride and sodium formaldehyde sulo phoxylate.

The foregoing metal aldehyde and ketone sulphoxylates or mixtures are powerful reducing agents, and, as has been stated, are particularly valuable for the production of discharge effects 35 on textile materials, and-particularly on textile materials made of or containing cellulose acetate, I cellulose formate, cellulose propionate, cellulose butyrate, or other organic ester of cellulose, or ethyl cellulose, methyl cellulose, benzyl cellulose, 40 or other cellulose ether. They may also be employed with advantage for the production of discharge eflects on mixed materials containing organic derivatives of cellulose and other fibres, or on cotton, silk, wool or regenerated cellulose 45 or other textile materials. The compounds may be employed for the production of white dis-' charges, or they may be employed in admixture with coloring matter resistant thereto and having an afllnity for or capable of being fixed on the materials for the production of colored discharges, e. g. the insoluble metal compounds of leuco vat dyes described in U. 8. application 8. No. 605,115 died April 13, 1932 corresponding-to Britishapplication No. 14728/31 flled 19th May, 1931. In applying the new process the materials may either first be colored and then the discharge composition applied or the material may first be printed with the discharge composition and the ground color then applied whereupon the latter does not develop in the printed areas.

The discharge compositions employed may contain in addition to the discharging agent or discharging mixture other substances, for example thickening agents, swelling or penetrating agents for the material under treatment, e. g. alcohols, phenols, or hydroquinone in the case of cellulose esters or ethers, and catalysts, e. g.'anthraquinone. After the application of the discharging preparations the material may be steamed. aged or otherwise treated to eifect or complete the discharging action and/or to fix any coloring matters simultaneously applied.

The following examples illustrate the invention without being in any way limitative:--

Example 1 A cellulose acetate material is dyed with 4-nitro-2-methoxy benzene-azo dimethyl-aniline, and printed with a freshly prepared print-,

ing paste containing:

Parts Sodium formaldehyde sulphoxylate 10 10 Methylated spirits Gum arabic 1: 50

Water 22.5

Stannous chloride crystals 7.5

It is then dried, aged for 5 minutes or longer in a Mather and Platt ager, washed, soaped and dried. A good white discharge is obtained on a red ground.

, Example 2 A cellulose acetate material is dyed a violet shade with the dyestufl obtained by diazotizing 5-nitro-2-amino-anisol and coupling with u-oxyethyl-a-naphthylamine, and is printed with a freshly prepared printing paste having the following composition:-

After printing, the material is dried, aged for 5 minutes in aMather and Platt ager, and then washed, soaped and dried when a good white discharge on a violet ground is obtained.

trample 3 aged for 5 minutes or more in a Mather and Platt ager, washed, soaped and'dried. A good white discharge is obtained on a yellow ground.

What I claim and desire to secure by Letters Patent is:-

1. Process for the production of pattern eflects' on textile materials containing an organic derivative of cellulose, which comprises locally discharging a dyes'tuif thereon by means of a titan- Ous aldehyde sulphoxylate.

2. Process for the production of pattern effects on textile materials containing organic derivatives of cellulose, which comprises locally discharging a dyestufl thereon by means of compounds selected from the group of titanous aldehyde and ketone sulphoxylates.

3. Process for the production of pattern effects on textile materials containing cellulose acetate, which comprises locally discharging a dyestufl thereon by means of compounds selected from the group of titanous aldehyde and ketone sulphoxyb ates.

4. Process for the production of pattern effects on textile materials containing cellulose acetate, which comprises locally discharging a dyestufl thereon by means of titanous formaldehyde sul- -phoxylate.

5. Discharge compositions suitable for use onmaterials comprising an organic derivative of cellulose, said compositions containing a compound selected from the group of titanous aldehyde and ketone sulphoxylates.

6. Discharge compositions suitable for use on materials comprising cellulose acetate, said compositions containing a compound selected from the group of titanous aldehyde and ketone sulphoxylates.

7. Discharge compositions suitable for use on materials comprising an organic derivative of cellulose, s'aidcompositions containing titanous aldehyde sulphoxylates.

8. Discharge compositions suitable for use on materials comprising cellulose acetate, said compositions containing titanous aldehyde suiphoxylates.

GEORGE HOLLAND ELLIS. 

